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Technology for regeneration of waste activated carbon for adsorbing saturated chlorohydrocarbon organic compounds and treatment of waste gas thereof

A technology for treating organic compounds and waste gas, which can be used in filter regeneration, petroleum industry, combustible gas purification, etc. It can solve problems such as difficulty in completely restoring the original performance of activated carbon, secondary pollution of the atmospheric environment, etc.

Active Publication Date: 2019-01-18
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this special adsorption saturated waste activated carbon, the current mainstream heating regeneration technology is not only difficult to completely restore the original performance of activated carbon, but also releases a large amount of chlorine-containing organic waste gas (CVOCs) during the regeneration process, causing secondary pollution of the atmospheric environment.

Method used

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  • Technology for regeneration of waste activated carbon for adsorbing saturated chlorohydrocarbon organic compounds and treatment of waste gas thereof
  • Technology for regeneration of waste activated carbon for adsorbing saturated chlorohydrocarbon organic compounds and treatment of waste gas thereof
  • Technology for regeneration of waste activated carbon for adsorbing saturated chlorohydrocarbon organic compounds and treatment of waste gas thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Activated carbon saturated with dichloromethane adsorption is selected as the raw material. The diameter of the rotary kiln used is 2000mm, the length of the cylinder is 45000mm, the rotation speed is 0.5r / min, and the inclination of the cylinder is 2°.

[0054] Sieve the waste activated carbon that absorbs dichloromethane to saturation, and then send it to the dryer through the conveyor belt device for pre-drying for 0.5h. Start the rotary kiln, ignite and heat up, and start filling when the temperature of the kiln tail rises to about 200°C. The pretreated activated carbon enters the kiln barrel through the material settling chamber at the kiln tail. With the continuous rotation of the barrel and the action of the activated carbon's own gravity, the activated carbon passes through the low-temperature drying zone, the medium-temperature pyrolysis carbonization zone and the high-temperature activation zone in sequence. Among them, the temperature in the low-temperature z...

Embodiment 2

[0057]The difference from Example 1 is only the difference in the selection of activated carbon. In embodiment 2, activated carbon saturated with trichlorethylene adsorption will be used as the regeneration object. Under the same operating conditions, another common waste activated carbon in the industry will be tested for regeneration. The regenerated activated carbon is denoted as AC-2. Record its exhaust gas as GAS-2.

Embodiment 3

[0059] The only difference from Example 1 is whether to add activation gas. In embodiment 3, water vapor will no longer be passed into the kiln body as activation gas in addition. CO in flue gas after combustion of natural gas only 2 and H 2 O and the water evaporated from saturated activated carbon are activated by heating. Other conditions remain unchanged, the regenerated activated carbon is recorded as AC-3, and its tail gas is recorded as GAS-3.

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Abstract

The invention discloses a technology for regeneration of waste activated carbon for adsorbing saturated chlorohydrocarbon organic compounds and treatment of waste gas thereof. A method is characterized in that the drying, heating and regeneration, carbon dioxide and water steam activation and the like are continuously performed on the waste activated carbon by a rotary kiln, and the acid oxidizingand other methods are used for activating. The technology has the advantages that the regeneration time is short, the restoration rate is high, and the adsorption property of the regenerated activated carbon is excellent; for a large amount of high-temperature tail gas of chloride-containing organic waste gas, the self high-temperature heat and water steam are used for catalytic reforming reaction, and the catalytic reforming efficiency can reach 100%; the organic waste gas is converted into hydrogen gas and other combustible gases, so that the waste resources can be recycled and reutilized,and the secondary pollution to environment is avoided.

Description

technical field [0001] The invention relates to a method for regenerating waste activated carbon, in particular to a method for activating and regenerating waste activated carbon containing organic compounds containing chlorinated hydrocarbons by using an internal heating type rotary kiln, and for regenerating waste activated carbon containing volatile chlorinated hydrocarbons released during the activation process. The waste gas treatment process belongs to the technical field of resource reuse and environmental protection. Background technique [0002] Activated carbon has a huge specific surface area, rich hierarchical porous structure, good physical and chemical stability, excellent adsorption performance, and high economic benefits, so it is one of the most popular adsorbents at present. In the process of vigorous development of industrial production, the use of activated carbon is increasing day by day, and the output of waste activated carbon is also increasing. If a...

Claims

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Application Information

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IPC IPC(8): B01J20/34B01D53/86B01D53/78B01D53/40B01D46/02B01D53/70
CPCB01D46/023B01D53/40B01D53/78B01D53/8662B01D2255/2073B01D2255/20753B01D2255/2092B01J20/34B01J20/3416B01J20/3466B01J20/3475B01J20/3483
Inventor 李灏阳李立清周柯王新伟
Owner CENT SOUTH UNIV
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